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Troubleshooting
32 333309E
* To determine if the fluid hose or gun is obstructed, relieve the pressure. Disconnect the fluid hose and place a con-
tainer at the pump fluid outlet to catch any fluid. Turn on the air just enough to start the pump. It the pump starts when
the air is turned on, the obstruction is in the hose or gun.
A and B fluid pressures not
consistent
Pump cavitation Suction tube and hose restricted
Suction inlet plumbing drawing air Suction hose and tube fittings are loose
allowing suction of air into pump
Ball check in pump is not checking Pump is contaminated with dried paint of
foreign materials
A or B fluid pressure falls off
after top change over
Pump cavitation Suction tube restricted
A or B pressure changes after
mix manifold is closed
External fluid leak Fix hose and fitting leaks
Internal leak of fluid pump seals or
check valves causing loss of outlet
pressure.
Clean or repair proportioning pump
Fluid relief valve opens allow-
ing fluid out of bottom port.
Fluid pressure in line
exceeded system pressure rat-
ing
Pump fluid pressure set too high. Reduce air supply pressure to proportioner
Unbalanced load between A and B
fluid pump.
Suction tube and hose restricted
Suction hose and tube fittings are loose
allowing suction of air into pump
Pump is contaminated with dried paint of
foreign materials
Fix hose and fitting leaks
Clean or repair proportioning pump
Filter plugged. Clean filters
Flush pump does not run Air supply to flush pump turned off Turn on air supply
Air supply pressure to flush pump set
too low
Increase air supply pressure
Mix manifold solvent valves not “on” Open flush valves and gun
Gun not triggered Trigger spray gun
Mix Manifold or mixed material hose
plugged
Repair and replace mix manifold and mixed
material hoses
Problem Cause Solution